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    • 3. 发明授权
    • Circuit for testing inductive coils
    • 感应线圈测试电路
    • US4746869A
    • 1988-05-24
    • US61093
    • 1987-06-10
    • Thomas G. SchragCharles F. HoodScott A. Morton
    • Thomas G. SchragCharles F. HoodScott A. Morton
    • G01R31/06
    • G01R31/06
    • An electrical circuit is provided for testing for an open circuit or short circuit in an inductive coil, solenoid, or the like. The preferred circuit includes a computer activated device for selectively imposing a direct current voltage on a coil, a detector for detecting current flow through the coil induced by the voltage and for producing a current flow signal indicative of the magnitude of the current flow, a comparator for comparing the current signal with the reference signal and for producing respective first and second comparison signals when the current flow magnitude is respectively less than or greater than a reference magnitude, and a computer for determining whether the respective first and second comparison signals are produced during respective first and second points in time, such being a test indicative of the electrical integrity of the coil, solenoid, or the like.
    • 提供电路用于测试感应线圈,螺线管等中的开路或短路。 优选的电路包括用于选择性地施加线圈上的直流电压的计算机激活装置,用于检测由电压引起的线圈的电流流动的检测器,以及用于产生指示电流大小的电流流动信号;比较器 用于将当前信号与参考信号进行比较,并且用于当电流流量大小分别小于或大于参考幅度时产生相应的第一和第二比较信号;以及计算机,用于确定在第一和第二比较信号期间是否产生相应的第一和第二比较信号 各自的第一和第二时间点,这是表示线圈,螺线管等的电气完整性的测试。
    • 5. 发明授权
    • Capacitance-type material level indicator
    • 电容式料位指示器
    • US4499766A
    • 1985-02-19
    • US411527
    • 1982-08-25
    • George H. FathauerCharles F. Hood
    • George H. FathauerCharles F. Hood
    • G01F23/26G01R27/26G01R35/00
    • G01F23/268G01F23/266Y10T307/779
    • A system and probe for indicating the level of material in a vessel as a function of material capacitance comprising a resonant circuit including a capacitance probe adapted to be disposed in a vessel so as to be responsive to variations in capacitance as a function of material level. An rf oscillator has an output coupled to the resonant circuit and to a phase detector for detecting variations in phase angle as a function of probe capacitance. Level detection circuitry is responsive to an output of the phase detector and to a reference signal indicative of a predetermined level of material for indicating material level as a function of a difference between capacitance at the probe and the reference signal. In the preferred embodiments of the invention disclosed, an automatic calibration circuit adjusts the resonance characteristics of the parallel resonant circuit of the reference signal indicative of a predetermined reference material level.
    • 一种用于指示容器中的材料的水平作为材料电容的函数的系统和探针,其包括谐振电路,该谐振电路包括适于设置在容器中的电容探针,以便响应于作为材料水平的函数的电容变化。 RF振荡器具有耦合到谐振电路的输出端和用于检测作为探头电容的函数的相位角变化的相位检测器。 电平检测电路响应于相位检测器的输出和指示用于指示材料电平的预定水平的参考信号,作为探针上的电容​​和参考信号之间的差异的函数。 在所公开的本发明的优选实施例中,自动校准电路调节并联谐振电路的谐振特性,该参考信号指示预定的参考材料电平。
    • 7. 发明授权
    • Capacitance-type material level indicator
    • 电容式料位指示器
    • US4800755A
    • 1989-01-31
    • US782466
    • 1985-10-01
    • George H. FathauerCharles F. Hood
    • George H. FathauerCharles F. Hood
    • G01F23/26G01R27/26
    • G01F23/266G01F23/268
    • A system and probe for indicating the level of material in a vessel as a function of material capacitance comprising a resonant circuit including a capacitance probe adapted to be disposed in a vessel so as to be responsive to variations in capacitance as a function of material level. An rf oscillator has an output coupled to the resonant circuit and to a phase detector for detecting variations in phase angle as a function of probe capacitance. Level detection circuitry is responsive to an output of the phase detector and to a reference signal indicative of a predetermined level of material for indicating material level as a function of a difference between capacitance at the probe and the reference signal. In the preferred embodiments of the invention disclosed, an automatic calibration circuit adjusts the resonance characteristics of the parallel resonant circuit of the reference signal indicative of a predetermined reference material level.
    • 一种用于指示容器中的材料的水平作为材料电容的函数的系统和探针,其包括谐振电路,该谐振电路包括适于设置在容器中的电容探针,以便响应于作为材料水平的函数的电容变化。 RF振荡器具有耦合到谐振电路的输出端和用于检测作为探头电容的函数的相位角变化的相位检测器。 电平检测电路响应于相位检测器的输出和指示用于指示材料电平的预定水平的参考信号,作为探针上的电容​​和参考信号之间的差异的函数。 在所公开的本发明的优选实施例中,自动校准电路调节并联谐振电路的谐振特性,该参考信号指示预定的参考材料电平。
    • 9. 发明授权
    • Capacitance-type material level indicator and method of operation
    • 电容式物位指示器及操作方法
    • US5245873A
    • 1993-09-21
    • US536951
    • 1990-06-11
    • George H. FathauerCharles F. Hood
    • George H. FathauerCharles F. Hood
    • G01F23/26
    • G01F23/266G01F23/268Y10T307/779
    • A system and probe for indicating the level of material in a vessel as a function of material capacitance comprising a resonant circuit including a capacitance probe adapted to be disposed in a vessel so as to be responsive to variations in capacitance as a function of material level. An rf oscillator has an output coupled to the resonant circuit and to a phase detector for detecting variations in phase angle as a function of probe capacitance. Level detection circuitry is responsive to an output of the phase detector and to a reference signal indicative of a predetermined level of material for indicating material level as a function of a difference between capacitance at the probe and the reference signal. In the preferred embodiments of the invention disclosed, an automatic calibration circuit adjusts the resonance characteristics of the parallel resonant circuit of the reference signal indicative of a predetermined reference material level.
    • 一种用于指示容器中的材料的水平作为材料电容的函数的系统和探针,其包括谐振电路,该谐振电路包括适于设置在容器中的电容探针,以便响应于作为材料水平的函数的电容变化。 RF振荡器具有耦合到谐振电路的输出端和用于检测作为探头电容的函数的相位角变化的相位检测器。 电平检测电路响应于相位检测器的输出和指示用于指示材料电平的预定水平的参考信号,作为探针上的电容​​和参考信号之间的差异的函数。 在所公开的本发明的优选实施例中,自动校准电路调节并联谐振电路的谐振特性,该参考信号指示预定的参考材料电平。
    • 10. 发明授权
    • Seed planter monitor
    • 种子播种机监视器
    • US4159064A
    • 1979-06-26
    • US821580
    • 1977-08-03
    • Charles F. Hood
    • Charles F. Hood
    • A01C7/10H03K21/18A01C7/18
    • A01C7/105H03K21/18Y10S111/903
    • A monitor for use with a multiple row seed planter including a hopper for holding a supply of seeds, a plurality of conduits for carrying seeds to corresponding planting rows, a variable speed rotatable drum for receiving seeds from the hopper and delivering seeds to the conduits, a variable pressure air blower for supplying pressurized air to the hopper and drum to facilitate the seed delivery and a voltage supply source from a tractor or other vehicle pulling the planter. The monitor includes a plurality of sensors for providing a plurality of electrical signals corresponding to the above-mentioned planter functions. The monitor also includes an electronic circuit connected with selected sensors for receiving the electrical signals and for producing a display, as selected by an operator, of the values of the aforementioned functions including a count of the seeds passing through each of the conduits, the value of the air pressure applied to the drum, a rotation count of the drum, and the number of seeds passing through each conduit per drum revolution. The circuits also include circuits connected to selected sensors for producing an alarm signal in response to predetermined conditions of the functions associated therewith, including the level of seeds contained in the hopper, the value of the voltage supplied to the monitor, the rate of passage of seeds through the conduits, and the rotational speed of the drum.
    • 一种用于多排种子播种机的监视器,包括用于保持种子供应的料斗,用于将种子运送到相应种植行的多个导管,用于从料斗接收种子并将种子输送到管道的变速可旋转滚筒, 用于向加料斗和滚筒供应加压空气以促进种子输送的可变压力鼓风机以及来自拖拉机或其它拖拉机的车辆的电压源。 监视器包括多个传感器,用于提供对应于上述播种机功能的多个电信号。 该监视器还包括与所选择的传感器连接的电子电路,用于接收电信号并用于产生由操作员选择的上述功能的值的显示器,包括通过每个导管的种子的计数值 施加到滚筒上的空气压力,滚筒的旋转计数以及通过每个滚筒转动的每个导管的种子数量。 电路还包括连接到选择的传感器的电路,用于响应于与其相关的功能的预定条件产生报警信号,包括包含在漏斗中的种子的水平,提供给监视器的电压值, 种子通过导管,以及滚筒的转速。